1. To obstruct computer access to social networking sites such as facebook, myspace, or twitter by using SonicWALL or similar.

2. The act of stopping someone from updating their status on social networking sites by placing obstacles in the way.

3. The act of employers blocking content from company owned computers.

Bud: my facebook and twitter arent working!
Angela: DAMN! we've been twitblock'd!
Bud: why does our boss always have to be such a twitblock!?!

Bud: I cant update my twitter anymore, please help!
IT Guy: We blocked social networking sites from the server.
Bud: you are such a twitblock! I hate you!
IT Guy: Sorry, I had to do it, the orders came from above.
Bud: Can we at least still look at porn?